souterrain.
underground
Meaning & usage
underground
Where this word comes from
Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Old French sus- French sou- Proto-Indo-European *ters- Proto-Indo-European *tersos Proto-Italic *terzos Proto-Indo-European *-nós Proto-Italic *-nos Proto-Italic *terzeznos Latin terrēnum Vulgar Latin *terranum Old French terrain French terrain French souterrain From sou- + terrain, based on the model of Latin subterraneus.
underground passage, tunnel
Where this word comes from
Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Old French sus- French sou- Proto-Indo-European *ters- Proto-Indo-European *tersos Proto-Italic *terzos Proto-Indo-European *-nós Proto-Italic *-nos Proto-Italic *terzeznos Latin terrēnum Vulgar Latin *terranum Old French terrain French terrain French souterrain From sou- + terrain, based on the model of Latin subterraneus.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.